It’s cheaper and cost effective due to government funding for Development efforts being cut. Open Source software can be customized (configured) for your use (e.g. dashboard displays, log file output, email capability, etc.). My agency still uses Serena Products, but development efforts are under to way to replace them with Open Source tools like Jenkins and possibly Git. Today’s economy isn’t the same and government agencies have to deal with less funding and still produce the same high-level quality applications.